328 " PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



umbilicus form feeble nodules. Aperture subcircular; peristome 

 double, the outer broadly expanded, somewhat auriculated at the 

 posterior angle and adnate to the preceding turn on the parietal wall, 

 marked by a series of concentric lamellae; the inner slightly exserted 

 and slightly reflected. Operculum typically annularid. 



The specimen described and figured, U.S.N.M. No. 35587S, was 

 received from Poey and was collected by Gundlach at Guisa, 

 Oriente Province. It has 5 whorls remaining and measures: Length, 

 15.4 mm.; greater diameter, 7.6 mm.; lesser diameter, 5.8 mm. 



ANNULARIA (TBOSCHELVINDEX) JIGUANENSIS (Pfelffer) 



Shell cylindro-conic, varying from flesh color to pale brown m 

 ground color, with interrupted spiral bands of brown; the elements 

 composing these bands are arranged in both axial and spiral series, 

 but they are not regularly distributed, the spaces separating them 

 varying greatly in width; the peristome may be rayed with brown or 

 white, the brown markings when present coinciding with the external 

 spiral bands, which show conspicuously in the aperture. Nuclear 

 whorls decollated in all our specimens. Postnuclear whorls strongly 

 rounded, marked by slightly retractively slanting, rather closely spaced, 

 threadlike axial riblets, of which two, three, four, or even more may be 

 gathered together to form tufts at the summit. The spiral sculpture 

 consists of tlu-eads about as strong as or a little stronger than the 

 axial ribs. The junctions of these with the axial ribs form slender, 

 elongated nodules, with their long axis parallel with the axial sculp- 

 ture. These nodules lend to the axial riblets a somewhat wavy out- 

 line. The spaces enclosed between the axial riblets and the spiral 

 threads are oval pits having their long axis parallel with the axial 

 sculpture. Suture strongly constricted. Periphery strongly rounded. 

 Base moderately long, well rounded, marked by spiral threads, which 

 are a little stronger than those on the spire. Within the umbilicus 

 additional spiral threads are present. The base is also marked by 

 the continuation of the axial ribs, which at their junction with the 

 spiral threads on the base and on the umbilical wall form weak 

 nodules. Aperture broadly oval ; peristome double, the inner slightly 

 exserted and reflected; the outer well expanded, a little narrower on 

 the parietal wall than on the rest, and slightly auriculated at the 

 posterior angle, adnate to the outer on the outer lip. 



The species is confined to Oriente Province, where it breaks up into 

 the several subspecies here defined : 



KEY TO THE SUBSPECIES OF ANNULARIA (TROSCHELVINDEX) JIGUANENSIS 



Last whorl solute jiguanensis 



Last whorl adnate. 



Outer peristome rayed negrosensis 



Outer peristome not rayed bairensis 



